Maximum Wireless Mini-Max (pre-2006) - Manual (Page 4)

When no data is received at the "In" terminal of a Maestro or MiniMax the meter will point to the 3 o'clock position. On a
Maestro, the north, south, east and, west LED's will be on.
If a sensor transmitter is no longer responding to the receiver, the pointer on Maestro and/or MiniMax will indicate which
transmitter is not responding.
The pointer at 12 o'clock indicates wind, 9 o'clock is temperature and between 7 and 8 o'clock (0MPH/-35degF) is rain.